Swivel hose fitting



Fb.17,1942. N M, COUTY 2,273,396

SWIVEL HOSE FITTING Filed April 5, 1941 INVENTOR NorrYyaz? M @cazzeg- Patented Feb. 17, 1942` 2,273,396 SWIVEL nosE FITTING vNorman M. Conty, Detroit, Mich., assigner to The Flex-O-Tube Company, a corporation of Delaware Application April 5, 1941, serial No. 386,919 1 claim. '(cl. zas-97.5)

This invention relates to swivel couplings for flexible hose and the like.

This invention is an improvement over the invention disclosed and claimed in an application for patent, Serial No. 226,087 filed August 22, 1938, by Norman'M. Couty, the applicant herein, which application has matured into U. S. Letters Patent No.'2,172 ,'650 dated September l2, 1939 entitled Male swivel nut connection.

The prior art includes a fitting of the general type disclosed and claimed herein, however, when a fitting such as disclosed and claimed in the said Letters Patent No. 2,172,650 is placed under vacuum, initial compression on the compressible gasket employed is relieved, the frluid seal normally obtained is lost, and leakage results.

The primary object of the instant invention is y to provide a fluid-tight swivel coupling usable under both, pressure and vacuum which will allow hose or tubing to swivel or rotate with 'respect to the part to which it is coupled.

Another object of the invention is to provide a simple, inexpensive swivel coupling for connecting exible hose and the like to a relatively fixed part which will permit the said hose to be used lar metal sleeve or washer I9, the said compressible annular gasket I8 being disposed at the inner end of the said counterbore I'I. The extreme end |50 of the tubular stem I5 of the coupling member I4 is flared or peened over to hold the swivel fitting y III in assembled relationship and to initially compress the said compressible .gasket I8 into sealed relationship between the tubular stem I5 and the male nut II at the counterbore I1.

Although the hose coupling member I4 is dicated as employing an inner tubular member within the threaded and swedged shell 2| to prevent collapsing of the flexible hose I3 when the shell 2| of the coupling member I4 is swedged onto the said flexible hose I3, it is obvious that any type of coupling means other than that shown may beemployed to connect the hose I3 to the coupling member I4.

under alternate pressure and vacuum without leakage.

Other objects of the invention will become ap- Referring now to the drawing wherein like numerals refer to like and corresponding parts throughout the several views, the swivel tting III illustrative of the invention disclosed in Fig. 1 comprises a male nut II threadable into a part I2 to which the flexible hose or the like I3 is to be connected, the'said fiexible hose I3 has a coupling member I4 fixed thereon which has a tubular stem I5 extending therefrom through a. sultable bore I6 in the said male -nut I I. The. tubular stem I5 of the coupling member I4 is sufficiently free within the bore I6 of the male nut I I to permit the coupling member I4 and the exlble hose I3 to which it is connected to swivel with respect to the said male nut I I. The said male nut II is counterbored at I1 to accommodate a compressible annular washer or gasket I8 of rubber, neoprene or the like and to accommodate an annu- Fluid under pressure within the fluid system to which the swivel fitting I0, the part I2 and the hose or the like I3 belong causes the hose coupling I4 and its tubular stem I5 to move in the direction indicated by the arrow 22 with respect to the male nut I I. This causes the metal washer I9 telescopingly fitted within the counterbore I1 to move axially against the compressible annular gasket I8 and further expand it within the counterbore I1 into increased sealed relationship between the said tubular stem I5 of the coupling member I4 and the male nut I I whereby to provide a fluid-tight seal therebetween which becomes tighter as the pressure in the fluid system increases.

If the pressure within the fluid system to which the said swivel fitting I0, the part I2 and the hose or the like I3 belong is changed to a vacuum, then the hose coupling I4 and its tubular stem I5 are yurged in the direction indicated by the arrow 23 with respect to the male nut II. Because the end face A of the swivel fitting III and the end face B of the male nut II are normally in contact, the hose coupling I4 and its tubular stem I5 cannot move with respect to the male nut I I when the fitting is under vacuum, and the seal created by the initial expansion of the compressible annular gasket I8 within the counterbore I1 is not adversely affected.

'Ihe swivel fitting IM disclosed in Fig. 2 is precisely the same as the swivel tting I0 disclosed in Fig. 1 with the exception that the counterbore I1 is located in the opposite end of the male nut II, the compressiblewasher I8 and annular metal sleeve or washer I9 located in the counterbore I'I are reversed, and the end face A of the swivel tting I and the end face B of the male nut II are spaced.

Fluid under pressure within the fluid system to which the swivel fitting |00, the part I2 and the hose or the like I3 belong causes the hose coupling member I4 and its tubular stem I5 to move in the direction indicated by the arrow 22 with respect to the male nut II. Because the peened over end I50 of the stem I5 of the hose coupling member I4 is tight against the end of the male nut II, as indicated by the numeral |500 in Fig. 2, the hose coupling member I4 and its tubular stem I5 cannot move with respect toV the male nutII when the fitting is under pressure. and the seal created by the initial expansion of the compressible annular gasket I8 within the counterbore I'I is not adversely aiected.

If iiuid within the uid system to which the said swivel tting |00, the part I2 and the hose 4or the like I3 belong is changed to a vacuum,

then the hose coupling member I4 and its tubular stem I5 are urged in the direction indicated by the arrow 23 with respect to the male nut II.`

This causes the metal washer I9 telescopingly fitted mithin the counterbore I'I to move axially against the compressible annular gasket I8 and further expand it within the counterbore I`I into increased sealed relationship between the said tubular stem I5 of the coupling member I4 and the male nut II whereby to provide a Huid-tight seal therebetween which becomes tighter as the vacuum in the fluid system increases.

Hence, in fluid systems where both pressure and vacuum occur and the pressure is predominant,'it is preferable to employ the embodiment of the invention disclosed in Fig. 1, and, in fluid systems where both pressure and vacuum occur and the vacuum is predominant, it is preferable to employ the embodiment of the invention dislclosed in Fig. 2.

Vas defined by the appended claim.

I claim:

In a swivel coupling including a coupling member composed of a tubular stem, a nut having an axialbore therein telescoped over said tubular stem, the said nut having a.v counterbore therein at one end thereof, and a deformable annular gasket in said counterbore, means for sealing against alternate internal pressure and vacuum comprising an annular sleeve telescopingly mounted in said counterbore contacting the said annular gasket and extending axially outward from the counterbored end of said nut, and means for holding said coupling member, nut, annular gasket and annular sleeve in assembled relationship simultaneously with initial deformation of the said annular gasket within said counterbore.

NORMAN M. COU-TY. 

